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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83eea9a4eee6c59cf106561bafc61a0b5ca58426b85f47b37186c8d94a51f97b' 
  AND token = 'VW09RhP1kKo58Hek2abtz/1UahHKrtXlV11zbg9zGH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}